Electronic calculator

Abstract

An electronic calculator includes input means for entering numeric data, and means for discriminating between the integral and the fractional part of a mixed fraction entered by said input means. According to the electronic calculator numeric data can be entered in accordance with the fractional expression.

We claim: 
     
       1. An electronic calculator comprising: input means having a keyboard for entering numeric data;   instruction means for developing a signal to instruct distinction between integral and fractional parts of a mixed fraction in the numeric data wherein the fractional part is to be entered from said keyboard in the form of a fraction;   control means responsive to the signal from said instruction means for generating control signals to control an arithmetic operation associated with the numeric data comprising the mixed fraction;   discriminating means for discriminating between the integral and fractional parts of the mixed fraction according to the control signals from said control means; and   means for processing the integral and fractional parts discriminated by said discriminating means.   
     
     
       2. An electronic calculator according to claim 1 wherein said instruction means include a keyswitch. 
     
     
       3. An electronic calculator comprising: a keyboard for entering numeric data;   a plurality of registers for storing the numeric data therein;   an operation control circuit for generatng signals to control an operation associated with the numeric data comprising integral and fractional parts of a mixed fraction;   means for discriminating between the integral and fractional parts entered from said keyboard to cause them to be stored in specified registers of said plurality of registers in accordance with the control signals from said operation control circuit.   
     
     
       4. An electronic calculator comprising: input means having numeral keys for entering numeric data and a plurality of function keys for instructing arithmetic operation;   first instruction means for developing a signal to instruct the distinction between integral and fractional parts of a mixed fraction in the numeric data;   second instruction means for developing a signal to instruct the distinction between the numerator and the denominator of the mixed fraction in cooperation with said first instruction means; and   operation control means responsive to the instruction signals from said first and second instruction means for generating control signals to control the operation associated with the numeric data comprising the mixed fraction.   
     
     
       5. An electronic calculator according to claim 4 wherein said first instruction means serve to instruct the distinction between the integral and fractional parts of the mixed fraction when cooperating with the second instruction means, and serve as means for entering decimal point information when not cooperating with the second instruction means. 
     
     
       6. An electronic calculator according to claim 4 wherein said fist instruction means has a keyswitch. 
     
     
       7. An electronic calculator according to claim 4 wherein said second instruction means has a keyswitch. 
     
     
       8. An electronic calculator according to claim 4 wherein said second instruction means is to be depressed after the denominator is entered from said numeric key. 
     
     
       9. An electronic calculator comprising: a keyboard having numeric keys for entering numeric data and a plurality of function keys for instructing arithmetic operations to be performed on the entered data;   an instruction key for providing a signal to distinguish between integral and fractional parts of a mixed fraction in the numeric data to be entered from said keyboard;   an operation control circuit for generating signals to control said arithmetic operations associated with the numeric data including the integral and fractional parts;   a plurality of registers, each of which is operative to selectively store entered numeric data therein; and   means coupled to said control circuit and said registers for discriminating between the integral and fractional parts entered from said keyboard to cause said parts to be stored in specified registers of said plurality of registers in accordance with the control signals from said operation circuit.   
     
     
       10. An electronic calculator comprising: input means for entering numeric data;   first discriminating means for discriminating between integral and fractional parts of a mixed fraction entered from said input means;   second discriminating means for discriminating between the numerator and denominator of the fractional part of the mixed fraction; and   means for processing the integral part and the fractional part including the numerator and denominator discriminated by said first and second discriminating means.   
     
     
       11. An electronic calculator according to claim 10, further comprising an instruction key for providing a signal to distinguish between integral and fractional parts of said mixed fraction, wherein said first discriminating means is operable in response to said signal. 
     
     
       12. An electronic calculator comprising: input means for entering numeric data;   means for discriminating between integral and fractional components of mixed numbers entered from said input means wherein the fractional components are entered in the form of fractions comprising numerators and denominators, and for producing corresponding output signals; and   means coupled to said discrimination means and responsive to said output signals for processing said numeric data wherein operations are selectively performed on each of said integral components, said numerators and said denominators.   
     
     
       13. An electronic calculator according to claim 12 further comprising: instruction means for developing a signal to instruct the distinction between the integral and fractional parts of the mixed fraction in the numeric data, and for enabling said discriminating means.   
     
     
       14. An electronic calculator according to claim 12, further comprising an instruction key for providing a signal to instruct the distinction between integral and fractional parts of said mixed fraction, wherein said discriminating means is operable in response to said signal. 
     
     
       15. An electronic calculator of the type wherein arithmetic operations are performed on mixed numbers entered therein, said calculator comprising: input means wherein operation instructions and integral, numerator and denominator components of said numbers are entered for generating respective signals corresponding thereto, said input means comprising discrimination means wherein information is entered to identify the respective entry of said integral, said numerator and said denominator components for generating discriminating signals corresponding thereto;   arithmetic control means coupled to said input means and including an arithmetic unit, said control means being responsive to said operation instructions for computing corresponding results;   means coupled to said control means and responsive to said discrimination signals for storing said integral, said numerator and said denominator signals, and for selectively entering said signals into said arithmetic unit in response to said operation instructions; and   output means coupled to said arithmetic unit for visually displaying the results computed by said control means.